com.fasterxml.jackson.databind.ser.std

Class MapSerializer

java.lang.Object

com.fasterxml.jackson.databind.JsonSerializer<T>

com.fasterxml.jackson.databind.ser.std.StdSerializer<T>

com.fasterxml.jackson.databind.ser.ContainerSerializer<Map<?,?>>

com.fasterxml.jackson.databind.ser.std.MapSerializer

All Implemented Interfaces:

JsonFormatVisitable, SchemaAware, ContextualSerializer

public class MapSerializer
extends ContainerSerializer<Map<?,?>>
implements ContextualSerializer

Standard serializer implementation for serializing {link java.util.Map} types.

Note: about the only configurable setting currently is ability to filter out entries with specified names.

Nested Class Summary

Nested classes/interfaces inherited from class com.fasterxml.jackson.databind.JsonSerializer

JsonSerializer.None

Field Summary

Fields

Modifier and Type	Field and Description
protected PropertySerializerMap	_dynamicValueSerializers If value type can not be statically determined, mapping from runtime value types to serializers are stored in this object.
protected Object	_filterId Id of the property filter to use, if any; null if none.
protected HashSet<String>	_ignoredEntries Set of entries to omit during serialization, if any
protected JsonSerializer<Object>	_keySerializer Key serializer to use, if it can be statically determined
protected JavaType	_keyType Declared type of keys
protected BeanProperty	_property Map-valued property being serialized with this instance
protected boolean	_sortKeys Flag set if output is forced to be sorted by keys (usually due to annotation).
protected JsonSerializer<Object>	_valueSerializer Value serializer to use, if it can be statically determined
protected JavaType	_valueType Declared type of contained values
protected boolean	_valueTypeIsStatic Whether static types should be used for serialization of values or not (if not, dynamic runtime type is used)
protected TypeSerializer	_valueTypeSerializer Type identifier serializer used for values, if any.
protected static JavaType	UNSPECIFIED_TYPE

Fields inherited from class com.fasterxml.jackson.databind.ser.std.StdSerializer

_handledType

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	MapSerializer(HashSet<String> ignoredEntries, JavaType keyType, JavaType valueType, boolean valueTypeIsStatic, TypeSerializer vts, JsonSerializer<?> keySerializer, JsonSerializer<?> valueSerializer)
protected	MapSerializer(MapSerializer src, BeanProperty property, JsonSerializer<?> keySerializer, JsonSerializer<?> valueSerializer, HashSet<String> ignored)
protected	MapSerializer(MapSerializer src, Object filterId, boolean sortKeys)
protected	MapSerializer(MapSerializer src, TypeSerializer vts)

Method Summary

Methods

Modifier and Type	Method and Description
protected JsonSerializer<Object>	_findAndAddDynamic(PropertySerializerMap map, Class<?> type, SerializerProvider provider)
protected JsonSerializer<Object>	_findAndAddDynamic(PropertySerializerMap map, JavaType type, SerializerProvider provider)
protected Map<?,?>	_orderEntries(Map<?,?> input)
MapSerializer	_withValueTypeSerializer(TypeSerializer vts) Method that needs to be implemented to allow construction of a new serializer object with given TypeSerializer, used when addition type information is to be embedded.
void	acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor, JavaType typeHint) Default implementation specifies no format.
static MapSerializer	construct(String[] ignoredList, JavaType mapType, boolean staticValueType, TypeSerializer vts, JsonSerializer<Object> keySerializer, JsonSerializer<Object> valueSerializer) Deprecated. Since 2.3 use the method that takes `filterId`
static MapSerializer	construct(String[] ignoredList, JavaType mapType, boolean staticValueType, TypeSerializer vts, JsonSerializer<Object> keySerializer, JsonSerializer<Object> valueSerializer, Object filterId)
JsonSerializer<?>	createContextual(SerializerProvider provider, BeanProperty property) Method called to see if a different (or differently configured) serializer is needed to serialize values of specified property.
JsonSerializer<?>	getContentSerializer() Accessor for serializer used for serializing contents (List and array elements, Map values etc) of the container for which this serializer is used, if it is known statically.
JavaType	getContentType() Accessor for finding declared (static) element type for type this serializer is used for.
JsonSerializer<?>	getKeySerializer() Accessor for currently assigned key serializer.
JsonNode	getSchema(SerializerProvider provider, Type typeHint) Default implementation simply claims type is "string"; usually overriden by custom serializers.
boolean	hasSingleElement(Map<?,?> value) Method called to determine if the given value (of type handled by this serializer) contains exactly one element.
boolean	isEmpty(Map<?,?> value) Method called to check whether given serializable value is considered "empty" value (for purposes of suppressing serialization of empty values).
void	serialize(Map<?,?> value, JsonGenerator jgen, SerializerProvider provider) Method that can be called to ask implementation to serialize values of type this serializer handles.
void	serializeFields(Map<?,?> value, JsonGenerator jgen, SerializerProvider provider) Method called to serialize fields, when the value type is not statically known.
protected void	serializeFieldsUsing(Map<?,?> value, JsonGenerator jgen, SerializerProvider provider, JsonSerializer<Object> ser) Method called to serialize fields, when the value type is statically known, so that value serializer is passed and does not need to be fetched from provider.
void	serializeFilteredFields(Map<?,?> value, JsonGenerator jgen, SerializerProvider provider, PropertyFilter filter) Helper method used when we have a JSON Filter to use for potentially filtering out Map entries.
protected void	serializeTypedFields(Map<?,?> value, JsonGenerator jgen, SerializerProvider provider)
void	serializeWithType(Map<?,?> value, JsonGenerator jgen, SerializerProvider provider, TypeSerializer typeSer) Method that can be called to ask implementation to serialize values of type this serializer handles, using specified type serializer for embedding necessary type information.
MapSerializer	withFilterId(Object filterId)
MapSerializer	withResolved(BeanProperty property, JsonSerializer<?> keySerializer, JsonSerializer<?> valueSerializer, HashSet<String> ignored) Deprecated.
MapSerializer	withResolved(BeanProperty property, JsonSerializer<?> keySerializer, JsonSerializer<?> valueSerializer, HashSet<String> ignored, boolean sortKeys)

Methods inherited from class com.fasterxml.jackson.databind.ser.ContainerSerializer

hasContentTypeAnnotation, withValueTypeSerializer

Methods inherited from class com.fasterxml.jackson.databind.ser.std.StdSerializer

createObjectNode, createSchemaNode, createSchemaNode, findConvertingContentSerializer, findPropertyFilter, getSchema, handledType, isDefaultSerializer, wrapAndThrow, wrapAndThrow

Methods inherited from class com.fasterxml.jackson.databind.JsonSerializer

getDelegatee, isUnwrappingSerializer, replaceDelegatee, unwrappingSerializer, usesObjectId

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

UNSPECIFIED_TYPE

protected static final JavaType UNSPECIFIED_TYPE

_property

protected final BeanProperty _property

Map-valued property being serialized with this instance

_ignoredEntries

protected final HashSet<String> _ignoredEntries

Set of entries to omit during serialization, if any

_valueTypeIsStatic

protected final boolean _valueTypeIsStatic

Whether static types should be used for serialization of values or not (if not, dynamic runtime type is used)

_keyType

protected final JavaType _keyType

Declared type of keys

_valueType

protected final JavaType _valueType

Declared type of contained values

_keySerializer

protected JsonSerializer<Object> _keySerializer

Key serializer to use, if it can be statically determined

_valueSerializer

protected JsonSerializer<Object> _valueSerializer

Value serializer to use, if it can be statically determined

_valueTypeSerializer

protected final TypeSerializer _valueTypeSerializer

Type identifier serializer used for values, if any.

_dynamicValueSerializers

protected PropertySerializerMap _dynamicValueSerializers

If value type can not be statically determined, mapping from runtime value types to serializers are stored in this object.

_filterId

protected final Object _filterId

Id of the property filter to use, if any; null if none.

Since:

2.3

_sortKeys

protected final boolean _sortKeys

Flag set if output is forced to be sorted by keys (usually due to annotation).

Since:

2.4

Constructor Detail

MapSerializer

protected MapSerializer(HashSet<String> ignoredEntries,
             JavaType keyType,
             JavaType valueType,
             boolean valueTypeIsStatic,
             TypeSerializer vts,
             JsonSerializer<?> keySerializer,
             JsonSerializer<?> valueSerializer)

MapSerializer

protected MapSerializer(MapSerializer src,
             BeanProperty property,
             JsonSerializer<?> keySerializer,
             JsonSerializer<?> valueSerializer,
             HashSet<String> ignored)

MapSerializer

protected MapSerializer(MapSerializer src,
             TypeSerializer vts)

MapSerializer

protected MapSerializer(MapSerializer src,
             Object filterId,
             boolean sortKeys)

Method Detail

_withValueTypeSerializer

public MapSerializer _withValueTypeSerializer(TypeSerializer vts)

Description copied from class: ContainerSerializer

Method that needs to be implemented to allow construction of a new serializer object with given TypeSerializer, used when addition type information is to be embedded.

Specified by:

_withValueTypeSerializer in class ContainerSerializer<Map<?,?>>

withResolved

@Deprecated
public MapSerializer withResolved(BeanProperty property,
                                    JsonSerializer<?> keySerializer,
                                    JsonSerializer<?> valueSerializer,
                                    HashSet<String> ignored)

Deprecated.

withResolved

public MapSerializer withResolved(BeanProperty property,
                         JsonSerializer<?> keySerializer,
                         JsonSerializer<?> valueSerializer,
                         HashSet<String> ignored,
                         boolean sortKeys)

Since:

2.4

withFilterId

public MapSerializer withFilterId(Object filterId)

Since:

2.3

construct

@Deprecated
public static MapSerializer construct(String[] ignoredList,
                                 JavaType mapType,
                                 boolean staticValueType,
                                 TypeSerializer vts,
                                 JsonSerializer<Object> keySerializer,
                                 JsonSerializer<Object> valueSerializer)

Deprecated. Since 2.3 use the method that takes `filterId`

construct

public static MapSerializer construct(String[] ignoredList,
                      JavaType mapType,
                      boolean staticValueType,
                      TypeSerializer vts,
                      JsonSerializer<Object> keySerializer,
                      JsonSerializer<Object> valueSerializer,
                      Object filterId)

Since:

2.3

createContextual

public JsonSerializer<?> createContextual(SerializerProvider provider,
                                 BeanProperty property)
                                   throws JsonMappingException

Description copied from interface: ContextualSerializer

Method called to see if a different (or differently configured) serializer is needed to serialize values of specified property. Note that instance that this method is called on is typically shared one and as a result method should NOT modify this instance but rather construct and return a new instance. This instance should only be returned as-is, in case it is already suitable for use.

Specified by:

createContextual in interface ContextualSerializer

Parameters:

provider - Serializer provider to use for accessing config, other serializers

property - Method or field that represents the property (and is used to access value to serialize). Should be available; but there may be cases where caller can not provide it and null is passed instead (in which case impls usually pass 'this' serializer as is)

Returns:

Serializer to use for serializing values of specified property; may be this instance or a new instance.

Throws:

JsonMappingException

getContentType

public JavaType getContentType()

Description copied from class: ContainerSerializer

Accessor for finding declared (static) element type for type this serializer is used for.

Specified by:

getContentType in class ContainerSerializer<Map<?,?>>

getContentSerializer

public JsonSerializer<?> getContentSerializer()

Description copied from class: ContainerSerializer

Accessor for serializer used for serializing contents (List and array elements, Map values etc) of the container for which this serializer is used, if it is known statically. Note that for dynamic types this may return null; if so, caller has to instead use ContainerSerializer.getContentType() and SerializerProvider.findValueSerializer(java.lang.Class<?>, com.fasterxml.jackson.databind.BeanProperty).

Specified by:

getContentSerializer in class ContainerSerializer<Map<?,?>>

isEmpty

public boolean isEmpty(Map<?,?> value)

Description copied from class: JsonSerializer

Method called to check whether given serializable value is considered "empty" value (for purposes of suppressing serialization of empty values).

Default implementation will consider only null values to be empty.

Specified by:

isEmpty in class ContainerSerializer<Map<?,?>>

hasSingleElement

public boolean hasSingleElement(Map<?,?> value)

Description copied from class: ContainerSerializer

Method called to determine if the given value (of type handled by this serializer) contains exactly one element.

Note: although it might seem sensible to instead define something like "getElementCount()" method, this would not work well for containers that do not keep track of size (like linked lists may not).

Specified by:

hasSingleElement in class ContainerSerializer<Map<?,?>>

getKeySerializer

public JsonSerializer<?> getKeySerializer()

Accessor for currently assigned key serializer. Note that this may return null during construction of MapSerializer: depedencies are resolved during createContextual(com.fasterxml.jackson.databind.SerializerProvider, com.fasterxml.jackson.databind.BeanProperty) method (which can be overridden by custom implementations), but for some dynamic types, it is possible that serializer is only resolved during actual serialization.

Since:

2.0

serialize

public void serialize(Map<?,?> value,
             JsonGenerator jgen,
             SerializerProvider provider)
               throws IOException,
                      JsonGenerationException

Description copied from class: JsonSerializer

Method that can be called to ask implementation to serialize values of type this serializer handles.

Specified by:

serialize in class StdSerializer<Map<?,?>>

Parameters:

value - Value to serialize; can not be null.

jgen - Generator used to output resulting Json content

provider - Provider that can be used to get serializers for serializing Objects value contains, if any.

Throws:

IOException

JsonGenerationException

serializeWithType

public void serializeWithType(Map<?,?> value,
                     JsonGenerator jgen,
                     SerializerProvider provider,
                     TypeSerializer typeSer)
                       throws IOException,
                              JsonGenerationException

Description copied from class: JsonSerializer

Method that can be called to ask implementation to serialize values of type this serializer handles, using specified type serializer for embedding necessary type information.

Default implementation will throw UnsupportedOperationException to indicate that proper type handling needs to be implemented.

For simple datatypes written as a single scalar value (JSON String, Number, Boolean), implementation would look like:

  // note: method to call depends on whether this type is serialized as JSON scalar, object or Array!
  typeSer.writeTypePrefixForScalar(value, jgen);
  serialize(value, jgen, provider);
  typeSer.writeTypeSuffixForScalar(value, jgen);

and implementations for type serialized as JSON Arrays or Objects would differ slightly, as START-ARRAY>/END-ARRAY and START-OBJECT>/END-OBJECT pairs need to be properly handled with respect to serializing of contents.

Overrides:

serializeWithType in class JsonSerializer<Map<?,?>>

Parameters:

value - Value to serialize; can not be null.

jgen - Generator used to output resulting Json content

provider - Provider that can be used to get serializers for serializing Objects value contains, if any.

typeSer - Type serializer to use for including type information

Throws:

IOException

JsonGenerationException

serializeFields

public void serializeFields(Map<?,?> value,
                   JsonGenerator jgen,
                   SerializerProvider provider)
                     throws IOException,
                            JsonGenerationException

Method called to serialize fields, when the value type is not statically known.

Throws:

IOException

JsonGenerationException

serializeFieldsUsing

protected void serializeFieldsUsing(Map<?,?> value,
                        JsonGenerator jgen,
                        SerializerProvider provider,
                        JsonSerializer<Object> ser)
                             throws IOException,
                                    JsonGenerationException

Method called to serialize fields, when the value type is statically known, so that value serializer is passed and does not need to be fetched from provider.

Throws:

IOException

JsonGenerationException

serializeFilteredFields

public void serializeFilteredFields(Map<?,?> value,
                           JsonGenerator jgen,
                           SerializerProvider provider,
                           PropertyFilter filter)
                             throws IOException,
                                    JsonGenerationException

Helper method used when we have a JSON Filter to use for potentially filtering out Map entries.

NOTE: initially only called externally, by AnyGetterWriter

Throws:

IOException

JsonGenerationException

Since:

2.3

serializeTypedFields

protected void serializeTypedFields(Map<?,?> value,
                        JsonGenerator jgen,
                        SerializerProvider provider)
                             throws IOException,
                                    JsonGenerationException

Throws:

IOException

JsonGenerationException

getSchema

public JsonNode getSchema(SerializerProvider provider,
                 Type typeHint)

Description copied from class: StdSerializer

Default implementation simply claims type is "string"; usually overriden by custom serializers.

Specified by:

getSchema in interface SchemaAware

Overrides:

getSchema in class StdSerializer<Map<?,?>>

Parameters:

provider - The serializer provider.

typeHint - A hint about the type.

Returns:

Json-schema for this serializer.

acceptJsonFormatVisitor

public void acceptJsonFormatVisitor(JsonFormatVisitorWrapper visitor,
                           JavaType typeHint)
                             throws JsonMappingException

Description copied from class: StdSerializer

Default implementation specifies no format. This behavior is usually overriden by custom serializers.

Specified by:

acceptJsonFormatVisitor in interface JsonFormatVisitable

Overrides:

acceptJsonFormatVisitor in class StdSerializer<Map<?,?>>

typeHint - Type of element (entity like property) being visited

Throws:

JsonMappingException

_findAndAddDynamic

protected final JsonSerializer<Object> _findAndAddDynamic(PropertySerializerMap map,
                                        Class<?> type,
                                        SerializerProvider provider)
                                                   throws JsonMappingException

Throws:

JsonMappingException

_findAndAddDynamic

protected final JsonSerializer<Object> _findAndAddDynamic(PropertySerializerMap map,
                                        JavaType type,
                                        SerializerProvider provider)
                                                   throws JsonMappingException

Throws:

JsonMappingException

_orderEntries

protected Map<?,?> _orderEntries(Map<?,?> input)